Abstract: A structure for three wheeled vehicles such that when the front handle bars are turned either the frame will be tilted in the direction of the turn or the wheels will be tilted parallely into the direction of the turn by providing in one form a means for rotatably mounting the frame upon a solid rear axle of the vehicle and in a second form by providing means to shift a pair of independent rotatably mounted axles to permit the wheels to be directed into the direction of the turn. In either situation the turning of the handle bars and the front wheel controls the attitude of the frame or the attitude of the wheels such that the unit will more easily corner or turn and thus decrease the possibility of tipping over.